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Old 24th February 2008, 11:09 PM   #21
OzMikeH is offline OzMikeH  Australia
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If you hammered the pen up and down on one spot you could punch a hole in the paper, then create a small tear, then attack the tear at 90 degrees with the pen again to rip a big hole in the drawing.

Sorry, nothing to do with CNC.
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Old 25th February 2008, 12:57 AM   #22
MJL21193 is offline MJL21193  Canada
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Quote:
Originally posted by gootee


That 'can be done', cheaply and even fairly simply.

One that I just recently ran across is here:

http://www.instructables.com/id/Easy...lling-Machine/
Hi Tom,
I'm very interested in this, but only in the X, Y axis for doing circuit boards. I wonder what the life span of the cutter would be?

The version above doesn't have the motor controllers or PC connection. Any links to one that will work in 2D?
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Old 12th June 2008, 07:15 PM   #23
marce is offline marce  United Kingdom
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a DIY CNC machine
Hi John and others.
If your cutting out the profile of a PCB use "fish tial" cutters rather than standard flute cutters they will last a lot longer, the glass fibres are not very edge friendly and soon blunt fluted cutters where as fish tails go on and on. Also if you have a bit of z adjustment you can vary where you cut on the cutter, and as standard PCB's are 1.6mm thick and a 2mm cutter has about a 20mm cutting edge you can make them last.
One of the first CNC machines I used was based on stepper motors, these tend to have no positional feedback and rely on counting the steps fed to the motors to give an feedback of position. The only problem was if you try to cut to much in one pass the motor can miss steps as it judders so it looses steps, so light multiple cuts are better, also puts less strain on cutter and gives a better finnish. For the best finish cut out just slightley larger than you required finished dimension then do a final finish cut with a higher rpm taking of the last half millimeter or less if accuracy allows, especially if cutting plywood as the top layers can tear easily, MDF is a doodle to machine, though the dust is terrible if you dont control it.
Must admit though having even a 2.5 axis CNC makes it so much easier, both my projects where helped greatly by the fact I could machine accurate templates that I then used for my router.
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Old 20th August 2008, 04:42 PM   #24
twitchie is offline twitchie  Canada
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I can't believe nobody is biting ...

I blame it all on you anyway Bas, it was a passing reference in one of your posts a while back that started me down this dark road



Click the image to open in full size.

Click the image to open in full size.

This is my plan - build something cheap and nasty with the tools on hand and then use that to cut parts for machine #2. This is the usual path for those who build a CNC machine and do not have access to, or do not want to pay for CNC machining services.

I got as far as finishing the 3 axis and need to mount my motors, but the controller is complete and tested successfully and then I need to mount the router. Unfortunately, more home improvement projects are taking priority currently.
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Old 20th August 2008, 10:24 PM   #25
Bas Horneman is offline Bas Horneman  Netherlands
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Quote:
I blame it all on you anyway Bas
Huh! Now I get the blame!

Or did I inspire you...

Whatever...looks very good so far!

PS. I wish I had the real estate most Canadians have!
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Old 22nd August 2008, 05:08 AM   #26
EmergencyDpt is offline EmergencyDpt  United States
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Wow.
Shame on you for putting this thing in front of me while I'm so far behind on my other projects.
Shame shame shame.
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Old 22nd August 2008, 09:44 AM   #27
Bas Horneman is offline Bas Horneman  Netherlands
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Shame on you for putting this thing in front of me while I'm so far behind on my other projects.
Indeed. Terrible behaviour. Perhaps we should consider banning twitchie!?
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Old 22nd August 2008, 10:21 AM   #28
jan.didden is offline jan.didden  Europe
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... or get this one:

http://www.elektor.com/magazines/200...e.495053.lynkx

or this one:

http://www.elektor.com/magazines/200...1).54404.lynkx

Jan Didden
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Old 27th August 2008, 06:01 PM   #29
twitchie is offline twitchie  Canada
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Don't worry about me Bas, with all these unfinished projects in front of me, I'm as good as banned, as I don't have as much time to hang out here it seems.

This is my progression, or spiral into the abyss may be a better description.

I started building FirstWatt F5, but I have modified FE126 from Dave to build into FrugalHorns to test the F5 with (and the F4 I already built), but to build the FH, I wanted CNC machined cabinets ... so I needed to build a CNC machine

I'm building a patio in the backyard right now though, so the CNC-FH-F5 will all have to wait

I promise to post any pics when (and if) I ever get this machine finished

BTW, my machine is based on a design called the JGRO (cnczone.com forum). I have the controller boards stuffed and tested (of course, the electronics part was not going to be the stumbling block) and a Bosch Colt laminate router ready to use as my spindle. I'm using 3/8" threaded rod for now.

I'm probably into the project for $400 now, $150 for the stepper motors, $90 for the stepper drive board, $120 for the router and then miscellaneous parts like the bearings (ebay), wood, EMT tubing and fasteners.

If nothing else, I've learned that I like delrin/acetal better than aluminum and plan on using it for building amps and cases in the future.
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Old 28th August 2008, 01:00 PM   #30
70 Chevelle is offline 70 Chevelle  United States
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Good stuff but i need one that will lathe inches worth of aluminum.
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